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G. D. KING. Manufacturing Paper-Pulp from Wood.

No. 225,988 Patented Mar. 30, I880.

N1 PETERS, PHuTO-UYHOGRAPHER. WASMINGTOMJ c.

lJNiTEn STATES TPATENT Trice.

GEORGE D. KING, OF OSWEGO, NEW YORK.

MANUFACTURING PAPER-PULP FROM WOOD.

SPECIFICATION formingpart of Letters Patent No. 225,988, dated March 30, 1880.

Application filed November 9, 1878.

To all whom it may concern Bu it known that I, GEORGE D. KING, of the city of Oswego, Oswego county, and State of New York, have invented certain new and useful Improvements in Millstones (so called) and Mills for Grinding Sawdust or W'ood, which improvements are fully set forth in the annexed specification and in the accompanying drawings.

The object of my invention is to provide an improved grinding-mill for reducing wood or wood-sawdust to paper-pulp; and it consists in the employment, in the construction of \vood-pulp-grinding mills, of grinding-stones composed mainly of emery rendered sufficiently adhesive for this purpose by making it into propcnshaped stones in any of the wellknown ways by which it is mixed with materials which permit stones so made to be used for wet-grinding without injury to them, and which may with advantage be employed for dry-grinding also, said stones being so constructed that emery forms the contiguous grinding-faces thereof.

Referring to the drawings, Figure 1 isa side elevation, partly in section, of a wood-pulp mill fitted with emery-stones, showing the manner of their arrangement therein. Fig. 2 is a plan view of one of the stones.

I11 the drawings, A is the frame. b is avertical spindle driven by a pulley, 61, carrying on its upper end, on a suitable frame, the lower grinding-stone, c. Secured to the top of frame A, as seen, is a cover, 13, upon the under side of which, or in any other convenient manner, is secured in a fixed position over the lower stone the upper grinding-stone, 0. Through the center of cover B a suitable opening is provided, through which the wood to be ground is fed to the stones, and a suitable dischargepassage for the ground pulp may be provided through cover B near its junction with frameA.

The frame carrying the lower stone, 0, with spindle b, is arranged to be adjusted vertically toward or from the upper stone by the lever and screw-rod, as shown, and in the usual manner.

The emery grinding-stones which I employ may be made in one piece, or they may be formed-of sections or segments, and when made of pieces the latter may be secured together in a proper position in the mill to serve the purpose herein set forth.

My within-described improvements provide for wet-grinding wood to make paper-pulp without subjecting the ground wood to the action of any oxidizable metallic surface, by coming in contact with which the ground wood becomes sometimes inconveniently stained, thereby presenting obstacles to bleaching and, furthermore, the action upon the wood of afine grinding-face, such as is provided by the face of an emery stone, serves to produce a pulp of fine quality.

I prepare the wood for grinding in the manner above set forth by first rendering it as fibrous as possible by subjecting it to the action of saws or similar instruments to reduce it 2. In a wood-pulp-grinding mill, the grind.

ing-stones c and e, constructed and arranged to operate together so as to present emeryfaced grinding surfaces only to the wood while being ground, substantially as and for the purpose set forth. I

In testimony of my said claims in this my specification I have hereto affixed my signature in presence of two witnesses.

GEORGE D. KING.

Witnesses:

S. A. WEBB, H. A. Jones. 

